Google Chart API:折线图 - 图表日期与日期相对应?

时间:2015-12-10 00:03:24

标签: javascript date charts google-visualization

我在制作包含垂直和水平轴日期的Google Chart API折线图时遇到问题。生成的图表应如下所示:

enter image description here

这是一些试图产生这种效果的代码:

<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script>
    google.load("visualization", "1", {packages:["LineChart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
     var data = new google.visualization.DataTable();
        data.addColumn('date', 'Date');
        data.addColumn('date', 'Target');
        data.addColumn('date', 'Results');
        data.addRows([
    [new Date(2015, 1 ,1), new Date(2015, 3 ,1),new Date(2015, 4 ,1)],
[new Date(2015, 3 ,1), new Date(2015, 4 ,1),new Date(2007, 4 ,15)],
]);

        var options = {'vAxis': {format:'MMM d, y'}};

      var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);


    //     var chart = new google.visualization.AnnotatedTimeLine(document.getElementById('chart_div'));
    //  chart.draw(data, {displayAnnotations: true});
      }

    </script>
    </head>
<body>
    <div id="chart_div" style="width: 300px; height: 240px;" ></div>


        </body>
    </html>        

但结果图表如下所示:

enter image description here

其中垂直轴显示的值与提供的日期值不对应。我尝试使用vAxis.format选项设置,但没有任何效果。

想知道纵轴如何显示'2015年2月'等?感谢。

1 个答案:

答案 0 :(得分:1)

由于您使用的是google.visualization.LineChart,因此需要加载corechart个包:

google.load("visualization", "1", { packages: ["corechart"] });

之后您可以指定日期类型值:

var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('date', 'Target');
data.addColumn('date', 'Results');
data.addRows([
      [new Date(2015, 6, 1), new Date(2016, 2 ,1), new Date(2015, 11 ,1)],
      [new Date(2015, 7 ,1), new Date(2016, 1 ,1), new Date(2015, 11 ,1)],
      [new Date(2015, 8 ,1), new Date(2015, 11 ,1), new Date(2015, 11 ,1)],
]);

示例

google.load("visualization", "1", { packages: ["corechart"] });
google.setOnLoadCallback(drawChart);
function drawChart() {
    var data = new google.visualization.DataTable();
    data.addColumn('date', 'Date');
    data.addColumn('date', 'Target');
    data.addColumn('date', 'Results');
    data.addRows([
          [new Date(2015, 6, 1), new Date(2016, 2 ,1), new Date(2015, 11 ,1)],
          [new Date(2015, 7 ,1), new Date(2016, 1 ,1), new Date(2015, 11 ,1)],
          [new Date(2015, 8 ,1), new Date(2015, 11 ,1), new Date(2015, 11 ,1)],
    ]);



    var options = {
         hAxis: {
             format: 'MMM d, y', 
         }
    };

    var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
    chart.draw(data, options);
}
<script type="text/javascript" src="https://www.google.com/jsapi"></script> 
<div id="chart_div" style="width: 480px; height: 320px;"></div>